Help!! 95 SE Won't Upshift at WOT-Now Won't Run-Fixed!!! - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

Reply
 
 
 
Thread Tools Search this Thread
Old 10-06-2004, 11:50 PM   #1
Junior Member
Posts like a Ricer Type-R
Thread Starter
 
Join Date: Oct 2004
Location: SW Ohio
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
95BlkBonnieSE is on a distinguished road
Default Help!! 95 SE Won't Upshift at WOT-Now Won't Run-Fixed!!!

I did a search and couldn't find any similar problems, so here goes:

95 Bonneville SE (N/A) Stock 4T60E, 102,000 miles. Works perfectly except it won't upshift at WOT. Revs climb to around 5500 and then just hang there, until throttle is partially closed. Happens in first and second (haven't tried maxing out 3rd yet).

TCC is working fine, no codes on scanner, no leaks, fluid level OK.

What has been tried so far:
Replaced tranny fluid and filter (no excessive metal in pan, fluid wasn't burnt)
Replaced Modulator - no difference.

Any Ideas, or is it rebuild time?

TIA for any help.

Warren
Cincinnati OH
95 Bonneville SE - Unmodded daily driver
95BlkBonnieSE is offline   Reply With Quote
Old 10-07-2004, 12:51 PM   #2
Senior Member
Certified Car Nut
 
Join Date: Oct 2003
Posts: 19,756
Thanks: 0
Thanked 0 Times in 0 Posts
1993 SLE is on a distinguished road
Default

so are u saying that when the gear selector is in D its doing this or when you have the selector in 1, 2, and 3??

third gear will never go into TCC lock up at WOT
1993 SLE is offline   Reply With Quote
Old 10-07-2004, 01:28 PM   #3
Junior Member
Posts like a Ricer Type-R
Thread Starter
 
Join Date: Oct 2004
Location: SW Ohio
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
95BlkBonnieSE is on a distinguished road
Default

Quote:
Originally Posted by 1993 SLE
so are u saying that when the gear selector is in D its doing this or when you have the selector in 1, 2, and 3??
Thanks for the reply!!

Yes, it is doing it in Drive.

I hooked up the scanner on the way in this morning, and in first gear, the revs start increasing more slowly at around 5000, and if I don't let up on the throttle, they climb very slowly to around 5200. But I did not see any indication on the scanner that the tranny was trying to shift.

Perhaps the problem is not the tranny itself but in the signal to the transmission controller?

At what RPM should the tranny upshift from 1st to 2nd at WOT?

I will continue to scan and see what else I can find.

Sorry for the 20 questions, and thanks for the help.

Warren
Cincinnati OH
95 Bonneville SE - Unmodded daily driver
95BlkBonnieSE is offline   Reply With Quote
Old 10-07-2004, 01:57 PM   #4
Junior Member
Posts like a Ricer Type-R
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

Need to get this clear.....during normal driving, you're ok? What RPM'* do you run at 55mph (cruise on, level ground) in OD?
willwren is offline   Reply With Quote
Old 10-07-2004, 11:52 PM   #5
Junior Member
Posts like a Ricer Type-R
Thread Starter
 
Join Date: Oct 2004
Location: SW Ohio
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
95BlkBonnieSE is on a distinguished road
Default

Quote:
Originally Posted by willwren
Need to get this clear.....during normal driving, you're ok? What RPM'* do you run at 55mph (cruise on, level ground) in OD?
Yes, during normal driving, everything is fine, just won't upshift at WOT.

RPM is around 1800 at 55mph in OD (cruise on, level ground). According to my OTC scanner (and how it feels), the Torque Converter clutch is functioning correctly, and it engages/disengages smoothly, so I don't think the problem is related to the TCC.

The speed sensor reads accurately according to the scanner, and all of the other data points in the scanner look reasonable.

There must be something obvious I'm missing, but I haven't had the opportunity to troubleshoot an electronically-controlled automatic before.

Thanks again,

Warren
Cincinnati OH
95 Bonneville SE - Unmodded daily driver
95BlkBonnieSE is offline   Reply With Quote
Old 10-08-2004, 12:07 AM   #6
Junior Member
Posts like a Ricer Type-R
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

I don't think it'* rebuild time. If the PCM calls for a shift, and it doesn't happen, it should set a code. So for some reason, your PCM isn't calling for a shift.

Can you tell us the TPS voltages at idle and WOT? You can do this with the ignition on, car off. Just move the throttle by hand under the hood, or by foot in the car without the engine running.
willwren is offline   Reply With Quote
Old 10-08-2004, 12:40 AM   #7
Junior Member
Posts like a Ricer Type-R
Thread Starter
 
Join Date: Oct 2004
Location: SW Ohio
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
95BlkBonnieSE is on a distinguished road
Default

Quote:
Originally Posted by willwren
Can you tell us the TPS voltages at idle and WOT?
The TPS voltages (Ignition on, engine not running-measured with foot on pedal to simulate actual driver input):

Throttle Closed: .39v
WOT: 3.91v (occasionally flickering to 3.93v)

Warren
Cincinnati OH
95 Bonneville SE - Unmodded daily driver
95BlkBonnieSE is offline   Reply With Quote
Old 10-08-2004, 12:49 AM   #8
Senior Member
Certified Car Nut
 
Join Date: Oct 2003
Posts: 19,756
Thanks: 0
Thanked 0 Times in 0 Posts
1993 SLE is on a distinguished road
Default

umm...that seems a little low on the WOT end

you want idle at about .71 and WOT at 4.35
1993 SLE is offline   Reply With Quote
Old 10-08-2004, 01:13 AM   #9
Junior Member
Posts like a Ricer Type-R
Thread Starter
 
Join Date: Oct 2004
Location: SW Ohio
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
95BlkBonnieSE is on a distinguished road
Default

Quote:
Originally Posted by 1993 SLE
umm...that seems a little low on the WOT end

you want idle at about .71 and WOT at 4.35
Funny, as you were posting that, I was looking at the TPS mod page...Tomorrow I'll mod the TPS to get the higher voltages.

I'll post the results after I'm done.

Thanks for the help!!

Warren
Cincinnati OH
95 Bonneville SE - Soon to be TPS-Modded daily driver
95BlkBonnieSE is offline   Reply With Quote
Old 10-10-2004, 01:04 PM   #10
Junior Member
Posts like a Ricer Type-R
Thread Starter
 
Join Date: Oct 2004
Location: SW Ohio
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
95BlkBonnieSE is on a distinguished road
Default Update-Now Engine Won't run...

OK, I replaced the TPS (just to be sure), modded it to get 4.35v at WOT, (Idle is around.66v), and put a 180 thermostat in it while I was there.

Now the car will not run. It cranks fine, and engine starts like normal, then IMMEDIATELY dies (stops right around the time I stop cranking).

I checked the following:
1. Codes: 1629 (this is a code that I had been getting before I touched the car, when it started and ran just fine), and an occasionat 0321 (which I had been geting intermittently before also).
2. Crank Sensor was replaced a month ago, and I verified that it is still working, the scanner shows RPM when cranking.
3. I can hear fuel pump prime, fuel pressure shows 48psi before cranking.
4. I am getting spark from all 3 coils, until it dies.
5. Fuel Injectors are firing (put a light on 2 of them and they lit up), until it dies.
6. Checked connectors were plugged in, and checked fuses.
7. Checked the pink wire going into the ICM, shows constant +12v when key is in Run or Crank position.
8. Unplugged Cam Sensor, car started a little harder, but it started then immediately died (same as before).
9. Tried different throtte positions, car always started. Revs were higher with more throttle, but engine died just as quickly.
10. Verified VATS system is working (checked both keys, security light comes on for a short period when key is turned to Run position, then goes out).
11. Disconnected battery for 1 hour to clear memory, still does it.
12. (Added) After the engine stops running, the Scanner shows VATS SYS switches from OFF to ON for a few seconds, then returns to OFF.

I'm stumped. Any wisdom on where to start (so to speak)?

Very frustrated...Thanks for any help you can give.

Warren
Cincinnati OH
95 Bonneville SE - Unrunning daily driver
95BlkBonnieSE is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Shudder on 1-2 upshift with hard acceration hawkjet 2000-2005 15 06-05-2007 12:39 PM
wot run gojo83 Your Other Rides: Pics & Videos 5 04-30-2007 11:34 PM
did some wot runs, now some Q's... Darrel General GM Chat 17 09-13-2006 07:30 PM
Engine died -won't run now Ghostrdr 1992-1999 20 04-21-2006 12:33 PM
Harsh upshift from 3rd to 4th gear int_53185 1992-1999 7 09-22-2004 11:41 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 11:37 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.